[Ngram UDF] Add Ngrams MV UDFs and minor refactor

[deemoliu]

Instructions:
This PR add uniqueNgramsMV UDFs to generate ngrams on mv columns and add minor refactor to uniqueNgrams
#12392

How to use

        {
          "columnName": "col_ngrams",
          "transformFunction": "uniqueNgramMV(col, 3)"
        },

        {
          "columnName": "col_1gram_2gram_3gram",
          "transformFunction": "uniqueNgramMV(col, 1, 3)"
        },

[codecov-commenter]

Codecov Report

❌ Patch coverage is 84.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.37%. Comparing base (76f2b7f) to head (8072494).
⚠️ Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
.../common/function/scalar/string/NgramFunctions.java	84.00%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #16671      +/-   ##
============================================
+ Coverage     63.32%   63.37%   +0.05%     
  Complexity     1380     1380              
============================================
  Files          3035     3035              
  Lines        176714   176753      +39     
  Branches      27121    27129       +8     
============================================
+ Hits         111896   112020     +124     
+ Misses        56232    56153      -79     
+ Partials       8586     8580       -6     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-11	63.31% <84.00%> (+0.03%)	⬆️
java-21	63.34% <84.00%> (+0.04%)	⬆️
temurin	63.37% <84.00%> (+0.05%)	⬆️
unittests	63.37% <84.00%> (+0.05%)	⬆️
unittests1	56.48% <84.00%> (+0.02%)	⬆️
unittests2	33.15% <0.00%> (+0.03%)	⬆️

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